Connected: An Internet Encyclopedia
RFC 1122 - 2.5 LINK LAYER REQUIREMENTS SUMMARY

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### 2.5 LINK LAYER REQUIREMENTS SUMMARY

                                                      |       | | | |S| |
                                                      |       | | | |H| |F
                                                      |       | | | |O|M|o
                                                      |       | |S| |U|U|o
                                                      |       | |H| |L|S|t
                                                      |       |M|O| |D|T|n
                                                      |       |U|U|M| | |o
                                                      |       |S|L|A|N|N|t
                                                      |       |T|D|Y|O|O|t
    FEATURE                                           |SECTION| | | |T|T|e
    --------------------------------------------------|-------|-|-|-|-|-|--
                                                      |       | | | | | |
    Trailer encapsulation                             |2.3.1  | | |x| | |
    Send Trailers by default without negotiation      |2.3.1  | | | | |x|
    ARP                                               |2.3.2  | | | | | |
      Flush out-of-date ARP cache entries             |2.3.2.1|x| | | | |
      Prevent ARP floods                              |2.3.2.1|x| | | | |
      Cache timeout configurable                      |2.3.2.1| |x| | | |
      Save at least one (latest) unresolved pkt       |2.3.2.2| |x| | | |
    Ethernet and IEEE 802 Encapsulation               |2.3.3  | | | | | |
      Host able to:                                   |2.3.3  | | | | | |
        Send & receive RFC-894 encapsulation          |2.3.3  |x| | | | |
        Receive RFC-1042 encapsulation                |2.3.3  | |x| | | |
        Send RFC-1042 encapsulation                   |2.3.3  | | |x| | |
          Then config. sw. to select, RFC-894 dflt    |2.3.3  |x| | | | |
      Send K1=6 encapsulation                         |2.3.3  | | | | |x|
      Use ARP on Ethernet and IEEE 802 nets           |2.3.3  |x| | | | |
    Link layer report b'casts to IP layer             |2.4    |x| | | | |
    IP layer pass TOS to link layer                   |2.4    |x| | | | |
    No ARP cache entry treated as Dest. Unreach.      |2.4    | | | | |x|

Next: 3. INTERNET LAYER PROTOCOLS

Connected: An Internet Encyclopedia
RFC 1122 - 2.5 LINK LAYER REQUIREMENTS SUMMARY